Here the data is slightly right skewed which means there is no symmetry in the distribution of waiter tips. We, cannot determine the probability for this case.
Now, we will look into the details of distribution,
Mean of distribution = $9.60
The standard deviation of the skewed data = $5.40
Tip to the waiter = $20
Now, understand a few terms,
Normal distribution, also known as  Gaussian distribution, is very commonly used for randomly generated variables.
The graph of normal distribution has some parameters: the average or mean which is the maximum point of the graph and it is the point about which the graph is symmetrical, and the standard deviation which tells how much each data point is away from the mean.
As the data is skewed so we can,t use the normal distribution, and no other details about the model and distribution are given in the problem. So, we cannot determine the Probability for this case.
To, learn about probability visit - https://brainly.com/question/8058700
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